The EShopps PF-800 Overflow Box provides a simple way to transport aquarium water to under cabinet sumps, refugiums, or wet/dry filters. The gravity-feed system eliminates the need for complicated drilling or aquarium modifications. The PF-800 exterior overflow box (clear) is 8" x 3.25" x 10". The EShopps PF-800 Overflow Box is appropriate for tanks up to 100 gallons.